Union Pacific Stock Falls by 20% in 6 Months on Lower Volumes Misses the estimates As of June 2015, Union Pacific Corporation (UNP) stock has fallen by about 20% over the past six months and by 4% over the last year. The company’s market capitalization has declined to $84 billion. Read more here: http://marketrealist.com/2015/07/union-pacific-stock-falls-20-6-months-lower-volumes/